A fast checklist for path mistakes, missing files, wrong working directories, and interpreter mismatches.
This message usually means the path is wrong, the file moved, the working directory is not what you think it is, or the referenced interpreter in a script shebang does not exist.
Verify the current directory, the exact path, letter casing, and whether the file really exists where the command expects it.
If it is a script, inspect the shebang because the missing path may be the interpreter rather than the script itself.
Do not assume the visible filename alone proves the full path is correct.
Do not ignore environment-specific path differences between local machines, containers, and CI.